Inconel 718* * Trade name of Special Metals Group of Companies
W.NR 2.4668
UNS N07718
AWS 013
UNS N07718
AWS 013
A Nickel-Chromium alloy being precipitation hardenable and
having high
creep-rupture strength at high temperatures to about 700OC
(1290OF).
It has higher strength than Inconel X-750 and better
mechanical
properties at lower temperatures than Nimonic 90 and Inconel
X-750.
Applications include:
- Gas Turbines
- Rocket Motors
- Space Craft
- Nuclear Reactors
- Pumps
| Approximate Chemical Composition | |
| Ni + Co | 50-55% |
| Cr | 17-21% |
| Fe | Bal |
| Nb+Ta | 4.75 - 5.5% |
| Mo | 2.8-3.3% |
| Ti | 0.65 - 1.15% |
| Al | 0.2 - 0.8% |
| DENSITY | 8.19 g/cm3 | 0.296 lb/in3 |
| MELTING POINT | 1336 oC | 2437 oF |
| COEFFICIENT OF EXPANSION | 13.0 µm/m °C ( 20 - 100°C) |
7.2 x 10-6 in/in
°F ( 70 - 212°F) |
| MODULUS OF RIGIDITY | 77.2 kN/m2 | 11197 ksi |
| MODULUS OF ELASTICITY | 204.9 kN/m2 | 29719 ksi |
| CONDITION OF SUPPLY | HEAT TREATMENT (AFTER FORMING) |
| No 1 Spring Temper/Spring Temper | 1. Solution Anneal at 980oC (1800oF)
for 1 hour and air cool and 2. Age harden at 720oC (1330oF) for 8 hours and furnace cool to 620oC (1150oF) and hold at 620oC (1150oF) for a total age hardening time of 18 hours and air cool. |
| No.1 Spring Temper/Spring Temper (NACE MRO175) |
1. 1010OC (1870OF) 2 hours and air cool. and 2. 790OC (1455OF) 6 hours and air cool. |
| CONDITION |
APPROX TENSILE STRENGTH |
APPROX SERVICE TEMPERATURE |
||||
| Annealed | 800-1000 N/mm2 | 116-145 ksi | - | - | ||
| No 1 Spring Temper | 1000-1200 N/mm2 | 145-175 ksi | - | - | ||
| No 1 Spring Temper + Annealed + Aged | 1250-1450 N/mm2 | 181-210 ksi | -200o to +550oC | -330o to +1020oF | ||
| Spring Temper | 1300-1500 N/mm2 | 189-218 ksi | - | - | ||
| Spring Temper + Annealed + Aged | 1250-1450 N/mm2 | 181-210 ksi | -200o to +550oC | -330o to +1020oF | ||
| STANDARDS | ||||
| AMS 5663 | AMS 5832 | AMS 5962 | AMS 5662 | ASTM B637 |
